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# JavaScript program to find Area and Perimeter of Rectangle

We are writing a JavaScript program to calculate the area and perimeter of a rectangle. The program will prompt the user to input the width and length of the rectangle, and then we will use these values to calculate the area and perimeter. We will be continuously using these formulas: area = width * length, and perimeter = 2 * (width + length) to find the desired measurements.

## Approach

The approach to find the Area and Perimeter of a rectangle in JavaScript can be done as follows −

Define the length and width of the rectangle using variables.

Calculate the Area by multiplying the length and width of the rectangle.

Calculate the Perimeter by adding the twice the length and twice the width of the rectangle.

Display the result of both Area and Perimeter.

Store the result in variables and return the values if needed.

Repeat the above steps for different sets of length and width as required.

## Example

Here is an example of a JavaScript program that calculates the area and perimeter of a rectangle −

// Function to find the area of a rectangle function findArea(width, height) { return width * height; } // Function to find the perimeter of a rectangle function findPerimeter(width, height) { return 2 * (width + height); } // Input for width and height var width = 5; var height = 10; // Calculate the area and perimeter var area = findArea(width, height); var perimeter = findPerimeter(width, height); // Output the results console.log("Area of rectangle: " + area); console.log("Perimeter of rectangle: " + perimeter);

## Explanation

First, two functions are defined -

**findArea**and**findPerimeter**to calculate the area and perimeter of the rectangle, respectively.The

**findArea**function takes two arguments -**width**and**height**and returns the result of**width * height.**The

**findPerimeter**function takes two arguments -**width**and**height**and returns the result of**2 * (width + height).**The width and height of the rectangle are defined with

**var width = 5**and**var height = 10.**The area and perimeter of the rectangle are calculated using the

**findArea**and**findPerimeter**functions and stored in the variables**area**and**perimeter.**Finally, the results are output to the console using

**console.log**and displayed in the format "Area of rectangle: X" and "Perimeter of rectangle: Y", where X is the area and Y is the perimeter.

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